Selling 4 packages of Cushing's Perfection Dyes. These 1/3 ounce packages are acid dyes so are suitable for feathers, wool, mohair, and nylon. They do NOT work on cotton, cellulose, linen or rayon. Silk may or may not work depending on its composition. Works great on feathers. Comes with instructions. Two packages are black dye and two packages are buttercup yellow dye. Free shipping in the USA.